QD Products
Mesolight’s CdSe/ZnS QDs
Size-dependent fluorescence property is probably the most unique and attractive feature of QDs. For instance, through controlling the particle size from 2-6 nm, the emission from CdSe QDs can be continuously tuned to from green to red that covers entire visible wavelength range. However, there are two issues associated with the fabrication and application of binary QDs such as CdSe. First, the formation of defects and surface-trap states results in the low luminescence efficiency and stability deficits. Although this problem can be minimized through nanocrystal surface-passivation with high bandgap inorganic material such as the most commonly used ZnS, the largely lattice mismatch between the core nanocrystal and passivation shell layer usually degrade the optical properties. Second, the extinction coefficient of QDs is also size-dependent – proportional to the volume of the particle. This means species labeled with 6 nm CdSe QDs will emit red light that is ~30 times stronger than the green light from a species that labeled with 2 nm green emitting QDs.
Unlike binary QDs, the GA_CdSe/ZnS QDs we developed are tuned to have different emissions by changing their composition in both CdSe core and ZnS shells. This allows the preparation of GA QDs with the approximately the same particle sizes (hence the same absorption and emission intensity) but different emission wavelength. Subsequently, this will enable the measurement of each of the species with the equal sensitivity. Our GA_QDs possess higher and more stable PL emission due to larger particle size, higher crystalline, hardened lattice structure, lower inter-diffusion, and spatial compositional fluctuation.
Technical Specifications

Emission Peak: 460-650 nm
FWHM: <30 nm
Quantum Yield: >85%
Surface Group: Octadecylamine (or customer required ligands)
Solvent: Toluene (or customer required solvents)

Shopping Cart
CdSe/ZnS QDs
Emission Peak
Quantum Yield
FWHM
Quality
Price
Quantity
Catalog
500 nm50-70%25-35 nm5mg $99
- +
CdSe/ZnS-500-05
15mg $199
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CdSe/ZnS-500-15
25mg $299
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CdSe/ZnS-500-25
520 nm60-80%25-30 nm5mg $99
- +
CdSe/ZnS-520-05
15mg $199
- +
CdSe/ZnS-520-15
25mg $299
- +
CdSe/ZnS-520-25
540 nm60-80%25-30 nm5mg $99
- +
CdSe/ZnS-540-05
15mg $199
- +
CdSe/ZnS-540-15
25mg $299
- +
CdSe/ZnS-540-25
560 nm70-90%25-30 nm5mg $99
- +
CdSe/ZnS-560-05
15mg $199
- +
CdSe/ZnS-560-15
25mg $299
- +
CdSe/ZnS-560-25
580 nm80-90%25-30 nm5mg $99
- +
CdSe/ZnS-580-05
15mg $199
- +
CdSe/ZnS-580-15
25mg $299
- +
CdSe/ZnS-580-25
600 nm80-90%25-30 nm5mg $99
- +
CdSe/ZnS-600-05
15mg $199
- +
CdSe/ZnS-600-15
25mg $299
- +
CdSe/ZnS-600-25
620 nm80-90%25-30 nm5mg $99
- +
CdSe/ZnS-620-05
15mg $199
- +
CdSe/ZnS-620-15
25mg $299
- +
CdSe/ZnS-620-25
640 nm50-70%25-30 nm5mg $99
- +
GA_CdSe/ZnS-640-05
15mg $199
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CdSe/ZnS-640-15
25mg $299
- +
CdSe/ZnS-640-25
※We also provide samples with customer specified surface groups, solvent, concentration, and emission wavelength.
Application case of Mesolight’s CdSe/ZnS QDs

cdse-anli.jpg

Cell imaging application

GA_CdS.jpg

Figure/Date source : Soenen SJ, Manshian BB, Aubert T, Himmelreich U, et al. The performance of gradient alloy quantum dots in cell labeling[J]. Biomaterials, 2014,35(26):7249-7258.

Studies by Catholic university of Leuven and the university of Ghent in Belgium demonstrated that our GA_CdSe/ZnS QDs have high fluorescence efficiency, good chemical stability, low toxicity, easy cell absorb, superior to the ordinary core-shell structure.